docs: update the readme of the example folder

Author: Rahul-4480

examples/complete/README.md

@@ -6,6 +6,6 @@
 public_subnet_ids              = ["subnet-050928489741239", "subnet-98347019238472343"]
 private_subnet_ids             = ["subnet-09483509823434", "subnet-57093487509234870"]
 vpc_id                         = "vpc-43523452345265253"
-atlantis_url = ""
-atlantis_gh_user                = "your-github-username"
-atlantis_repo_allowlist         = ["repo1", "repo2"]
+atlantis_url                   = "example.your-domain.com"
+atlantis_gh_user               = "your-github-username"
+atlantis_repo_allowlist        = ["repo1", "repo2"]